...Severe blows on the head, striking the head against some hard object whilerunning, or falling on the head may cause concussion of the brain... 
U.S. Department of Agriculture 「Special Report on Diseases of Cattle」
...This maybe done with a chisel and a small hammer if the bandage is carefully held by anassistant so that the concussion of the blows is not transmitted to the injuredbones...
U.S. Department of Agriculture 「Special Report on Diseases of Cattle」
...sense of hearing in all species offish is a matter of concussion on the surface of the water...
Charles Bradford 「The Determined Angler and the Brook Trout」
...Dazed by the concussion, but unhurt, Dixoncautiously went over to investigate the result of the explosion...
Various 「Astounding Stories, May, 1931」
...I was smashed flat by a stunning concussion...
Various 「Astounding Stories, June, 1931」
...A long time later the concussion of a vast explosion...
Various 「Astounding Stories of Super-Science, August 1930」
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